ald: The Asymmetric Laplace Distribution

It provides the density, distribution function, quantile function,
random number generator, likelihood function, moments and Maximum Likelihood estimators for a given sample, all this for
the three parameter Asymmetric Laplace Distribution defined
in Koenker and Machado (1999). This is a special case of the skewed family of distributions
available in Galarza (2016) <http://www.ime.unicamp.br/sites/default/files/rp07-16.pdf> useful for quantile regression.